JP2015160486A - Back door attachment structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a back door attachment structure which can suppress an increase of a mass and cost by improving the rigidity of a hinge attachment part without enlarging a plate thickness.SOLUTION: In a door inner panel 20 and a hinge reinforcement 24, offset faces 20D, 24B which protrude to a vehicle rear side with respect to hinge attachment seat faces 20C1, 24A1 are formed around hinge attachment seat parts 20C, 24A. By this constitution, wall parts 20E, 24C which connect both the offset faces 20D, 24B and the hinge attachment seat parts 20C, 24A in a vehicle width direction are arranged between the offset faces and the hinge attachment seat parts, and inclined wall parts 20G, 24E which connect the offset faces 20D, 24B and general parts 20F, 24D in a vehicle vertical direction are arranged between the offset faces and the general parts. As a result, in the door panel 20 and the reinforcement 24, the rigidity of a hinge attachment part 32 can be improved without enlarging a plate thickness.

Description

  The present invention relates to a back door mounting structure.

  For example, Patent Document 1 below discloses a technique related to a mounting seat surface structure of a back door of an automobile. In this prior art, in the hinge mounting portion that is provided outside the vehicle width direction and to which the hinge portion is mounted to open the back door, the panel surface that connects the hinge mounting portions is provided on the same plane of the hinge mounting seat surface. Yes. Thereby, it is described that the rigidity of the hinge mounting portion is improved.

  Patent Document 2 below discloses a technique in which a reinforcing plate is joined to a door inner panel that constitutes a part of a back door. By joining a reinforcing member to the door inner panel, the door inner panel is disclosed. The fact that the rigidity has been improved is described.

JP 05-319097 A Japanese Patent Laid-Open No. 06-171369

  In general, when the back door is closed, stress concentrates on the hinge mounting portion, and therefore, the hinge mounting portion may be deformed by a repeated load due to opening and closing of the back door. For this reason, it is necessary to further improve the rigidity of the hinge mounting portion.

  In view of the above facts, the present invention has an object to obtain a back door mounting structure capable of suppressing an increase in mass and cost by improving the rigidity of the hinge mounting portion without increasing the plate thickness. .

  In order to achieve the above object, a back door mounting structure according to claim 1 includes a door inner panel constituting an inner plate of a back door that opens and closes an opening formed at a rear portion of a vehicle body, and the door inner panel. A hinge reinforcement joined to a rear surface of the vehicle longitudinal direction, a hinge mounting seat provided on the door inner panel and the hinge reinforcement, to which a hinge member for opening and closing the back door is mounted, and around the hinge mounting seat And on the vehicle width direction outside of the hinge mounting seat surface, an offset surface that is recessed or projected in the vehicle front-rear direction and has an angle in the vehicle front-rear direction with respect to the hinge mounting seat surface, and provided on the offset surface, A joining portion for joining the door inner panel and the hinge reinforcement;

  In the back door mounting structure according to the first aspect, the hinge reinforcement is joined to the rear surface in the vehicle longitudinal direction of the door inner panel constituting the inner plate of the back door. The door inner panel and the hinge reinforcement are each provided with a hinge mounting seat surface to which a hinge member for opening and closing the back door is mounted. Around the hinge mounting seat surface and on the outer side in the vehicle width direction of the hinge mounting seat surface is an offset surface that is recessed or projected in the vehicle longitudinal direction and has an angle in the vehicle longitudinal direction with respect to the hinge mounting seat surface. Each is provided.

  As a result, in the door inner panel and the hinge reinforcement, at least the first wall portion connecting the both in the vehicle width direction is provided between the offset surface and the hinge mounting seat surface, and the offset surface and the hinge mounting are provided. Between the general part provided with the seating surface, a second wall part that connects the both in the vehicle vertical direction is provided. As a result, in the door inner panel and the hinge reinforcement, the rigidity of the hinge mounting seat surface can be improved without increasing the plate thickness. Thereby, the rigidity of the hinge attachment part which consists of the hinge attachment seat surface of a door inner panel and the hinge attachment seat surface of hinge reinforcement can be improved further.

  Furthermore, in the present invention, a joint portion for joining the door inner panel and the hinge reinforcement is provided on the offset surface having an angle in the vehicle front-rear direction with respect to the hinge mounting seat surface. When viewed along the vehicle vertical direction, the offset surface is arranged in a state intersecting with the load input when the back door is closed, so by providing a joint on the offset surface, Shear force will act. Thereby, compared with the case where the stress of a peeling direction acts in a junction part, the joint strength in a door inner panel and hinge reinforcement can be improved.

  The back door mounting structure according to claim 2 is the back door mounting structure according to claim 1, wherein the joint portion extends along a vehicle width direction of a fastener that fixes the hinge member on the hinge mounting seat surface. It is arranged on the upper side in the vehicle vertical direction with respect to the extension line.

  In the back door mounting structure according to claim 2, the joint portion is arranged on the vehicle vertical direction upper side of the extension line along the vehicle width direction of the fastener that fixes the hinge member on the hinge mounting seat surface. In the hinge reinforcement, the joint portion is provided on the outer edge side.

  Thereby, when closing a back door in the outer edge part side of hinge reinforcement, peeling from the door inner panel of hinge reinforcement can further be suppressed. That is, the rigidity of the hinge mounting portion can be improved by providing the joint portion on the upper side in the vehicle vertical direction of the hinge mounting portion where moment load concentrates when the back door is closed.

  The back door mounting structure according to claim 3 is the back door mounting structure according to claim 1 or 2, wherein the offset surface is recessed backward in the vehicle front-rear direction with respect to the hinge mounting seat surface. Provided in the recess.

  In the back door mounting structure according to the third aspect, when the offset surface is formed, a recess is provided in the rear side in the vehicle front-rear direction as viewed from the vehicle interior side with respect to the hinge mounting seat surface. For this reason, a vehicle interior space can be made wider compared with the case where a convex part is provided in the vehicle front-rear direction front side as viewed from the vehicle interior side. Moreover, since the convex part does not interfere when the hinge part is attached to the hinge mounting seating surface, the mounting workability is good.

  The back door mounting structure according to claim 4 is the back door mounting structure according to claim 3, wherein the cross-sectional shape of the recess cut along the vehicle vertical direction has a top on the rear side in the vehicle longitudinal direction. The top part has shifted | deviated to the vehicle up-down direction with respect to the extension line along the vehicle width direction of the fastener which fixes the said hinge member.

  In the back door mounting structure according to claim 4, the cross-sectional shape of the recess cut along the vehicle vertical direction forms a V shape having a top portion on the vehicle longitudinal direction rear side. Compared to the case where the top portion is provided on the extension line along the vehicle width direction of the fastener by shifting the top portion in the vehicle vertical direction with respect to the extension line along the vehicle width direction of the fastener fixing the hinge member. And since a load is received by a surface, when a load is input into a hinge attachment seat surface, the deformation | transformation in the said recessed part can be suppressed.

  As described above, the back door mounting structure according to the first aspect of the present invention can suppress an increase in mass and cost by improving the rigidity of the hinge mounting portion without increasing the plate thickness. Has an excellent effect.

  The back door mounting structure according to the second aspect of the present invention has an excellent effect that the deformation of the hinge mounting portion can be suppressed by improving the rigidity of the hinge mounting portion.

  The back door mounting structure according to the third aspect of the present invention has an excellent effect that a vehicle interior space can be secured.

  The back door mounting structure according to the fourth aspect of the present invention has an excellent effect that deformation in the recess can be suppressed.

It is the perspective view which looked at the back door to which the back door attachment structure concerning this embodiment was applied from the diagonally right rear side. It is a schematic sectional drawing which shows the state cut | disconnected along 2-2 line | wire of FIG.1 and FIG.4. It is a principal part expansion disassembled perspective view which shows the structure of the back door attachment structure which concerns on this Embodiment. It is the perspective view seen from the vehicles back side which shows the composition of the back door attachment structure concerning this embodiment. It is a schematic sectional drawing which shows the state cut | disconnected along line 5-5 of FIG. It is a comparative example and is a cross-sectional view corresponding to FIG.

  Hereinafter, embodiments according to the present invention will be described in detail with reference to the drawings. For convenience of explanation, an arrow UP appropriately shown in each drawing is an upward direction of the vehicle body, an arrow FR is a forward direction of the vehicle body, and an arrow OUT is an outer side of the vehicle width direction. Further, in the following description, when using the front / rear, top / bottom, and left / right directions, the front / rear direction of the vehicle body, the top / bottom direction of the vehicle body, and the left / right direction of the vehicle body (vehicle width direction) are indicated.

(Configuration of back door mounting structure)
First, the configuration of the back door mounting structure according to the present embodiment will be described. As shown in FIG. 1, a back door 16 is provided at the rear end of the vehicle (vehicle body) 12 for opening and closing an opening 14 that opens rearward in the vehicle front-rear direction.

  Hinge members 18 (described later) are provided on the upper edge portion of the back door 16 on both sides in the vehicle width direction. The back door 16 rotates around a shaft portion 19 (see FIG. 2) centering on the hinge member 18 so that the opening 14 at the rear end of the vehicle 12 is opened and closed.

  Although not shown, for example, a piston damper is disposed between the periphery of the opening 14 and the back door 16. A housing of the piston damper is attached to the periphery of the opening 14, and a rod is attached to the back door 16. As a result, the housing rotates in accordance with the opening degree of the back door 16, and the rod can enter and exit the housing. By this piston damper, the state where the back door 16 is completely opened is maintained, and the impact when the back door 16 is closed is reduced.

  FIG. 2 is a cross-sectional view taken along line 2-2 in FIGS. As shown in FIG. 2, the back door 16 includes a door inner panel 20 (see FIG. 2) that is disposed at a front portion in the vehicle front-rear direction of the back door 16 and constitutes an inner plate of the back door 16, and the door inner panel 20. The door outer panel 22 is arranged at the rear part in the vehicle front-rear direction and constitutes the outer plate of the back door 16. A hinge reinforcement 24 is joined to the rear surface 20A of the door inner panel 20 in a region including the hinge member 18 (described later).

  The door inner panel 20, the door outer panel 22, and the hinge reinforcement 24 are formed of a metal such as a steel plate or an aluminum alloy. Further, the outer edge portion 22A of the door outer panel 22 is hemmed in a state where the outer edge portion 20B of the door inner panel 20 is sandwiched, and a closed section 26 is formed between the door inner panel 20 and the door outer panel 22. ing.

  Here, the hinge member 18 is provided at the upper edge of the door inner panel 20 and the opening 14 of the vehicle 12 shown in FIG. 1, and as shown in FIG. 2, the door inner panel 20 and the hinge are provided. Hinge attachment seats 20C and 24A constituting a hinge attachment seat surface for attaching the hinge member 18 are provided on the upper edge of the reinforcement 24, respectively. In the present embodiment, the hinge mounting seat portion 20C and the hinge mounting seat portion 24A may be referred to as a hinge mounting portion 32.

  FIG. 3 is a perspective view of the hinge reinforcement 24 and the door inner panel 20 constituting the back door mounting structure 10 in an enlarged state when viewed from the vehicle rear side. As shown in this figure, the door inner panel 20 and the hinge mounting seats 20C, 24A of the hinge reinforcement 24 are substantially rectangular in plan view, and are formed along the vehicle width direction. As shown in FIG. 4, the hinge reinforcement 24 is joined to the rear surface 20A of the door inner panel 20, and is joined to each other by spot welding in this embodiment (joint portion 34).

  In the door inner panel 20 and the hinge reinforcement 24, as shown in FIG. 2, a recess recessed toward the rear side in the vehicle front-rear direction around each hinge mounting seat 20 </ b> C, 24 </ b> A and along the vehicle width direction. 25 are provided in the recess 25, and offset surfaces 20D and 24B having an angle in the rearward direction of the vehicle with respect to the hinge mounting seat surfaces 20C1 and 24A1 of the hinge mounting seats 20C and 24A are provided in the concave portion 25, respectively. .

  And in the door inner panel 20, the wall part 20E as a 1st wall part which connects both in the vehicle width direction is provided between offset surface 20D and the hinge attachment seat part 20C. In addition, between the offset surface 20D and the general portion 20F provided with the hinge mounting seat portion 20C, the inclined wall 20G as a second wall portion that connects the two in the vehicle vertical direction and the wall portion that connects both in the vehicle width direction. A wall portion 20H (see FIG. 3) facing 20E is provided.

Further, in the hinge reinforcement 24, a wall portion 24C serving as a first wall portion that connects the two in the vehicle width direction is provided between the offset surface 24B and the hinge mounting seat portion 24A. In addition, between the offset surface 24B and the general portion 24D provided with the hinge mounting seat portion 24A, an inclined wall 24E serving as a second wall portion that connects the two in the vehicle vertical direction and a wall portion that connects both in the vehicle width direction. A wall 24F (see FIG. 3) facing the 24C is provided.
Is provided.

  Furthermore, as shown in FIG. 2, the cross-sectional shape cut along the vehicle vertical direction including the offset surfaces 20D and 24B has a V-shape having a top portion 36 on the rear side in the vehicle front-rear direction. The top portion 36 is provided on the vehicle vertical direction lower side than the extension line Q along the vehicle width direction passing through the position where the bolt 40 as the fastener for fixing the hinge member 18 is fastened (see FIG. 4). . The offset surfaces 20D and 24B are provided with a joint 34 in spot welding, and the joint 34 is provided on the upper side in the vehicle vertical direction with respect to the extension line Q.

(Operation and effect of back door mounting structure)
Next, the operation and effect of the back door mounting structure according to the present embodiment will be described. As shown in FIG. 2, in the present embodiment, the hinge reinforcement 24 is joined in a region including the hinge member 18 on the rear surface 20 </ b> A of the door inner panel 20. Thereby, the rigidity of the door inner panel 20 can be improved.

  Further, in the present embodiment, in the door inner panel 20 and the hinge reinforcement 24, a recess 25 is provided on the outside around the hinge mounting seats 20C and 24A and along the vehicle width direction. The recess 25 is provided with offset surfaces 20D and 24B each having an angle on the rear side in the vehicle longitudinal direction with respect to the hinge mounting seat surfaces 20C1 and 24A1.

  Thus, between the offset surfaces 20D and 24B and the hinge mounting seats 20C and 24A, wall portions 20E and 24C are provided to connect the two at least in the vehicle width direction, and the offset surfaces 20D and 24B and the general portion are provided. Between 20F and 24D, inclined walls 20G and 24E are provided to connect the two in the vehicle vertical direction. As a result, in the door inner panel 20 and the hinge reinforcement 24, the rigidity of the hinge mounting seats 20C and 24A can be improved. That is, in the door inner panel 20 and the hinge reinforcement 24, the rigidity of the hinge mounting portion 32 can be improved without increasing the plate thickness, and an increase in mass and cost can be suppressed.

  Furthermore, in this embodiment, the junction part 34 in spot welding is provided in the said offset surfaces 20D and 24B. The offset surfaces 20D and 24B have an angle on the rear side in the vehicle front-rear direction with respect to the hinge mounting seat surfaces 20C1 and 24A1.

  Here, when the back door 16 is closed, the load (F) input to the hinge mounting seat portions 20C and 24A acts in a substantially vertical direction with respect to the hinge mounting seat surfaces 20C1 and 24A1. On the other hand, the outer edge portion 20 </ b> B of the door inner panel 20 is hemmed to the door outer panel 22 and is restrained by the door outer panel 22. When the hinge reinforcement 24 is joined to the door inner panel 20, the joining portion 34 is provided on the inner side in the plane direction from the outer edge portion 24 </ b> F of the hinge reinforcement 24 in order to secure a joining allowance (L).

  That is, the outer edge 24F of the hinge reinforcement 24 is a free end. For example, as shown in FIG. 6, when the joint portion 102 is provided on the same plane as the hinge attachment portion 100, the position of the hinge attachment portion 100 and the position of the joint portion 102 when viewed along the vehicle vertical direction. Positions overlap. In such a case, when a load (F) is input to the hinge mounting portion 100 when the back door 104 is closed, the periphery of the joint portion 102 of the hinge reinforcement 106 is arranged in a direction substantially orthogonal to the load input direction. Will be.

  When the load (F) is input, the stress (F1) in the peeling direction acts on the outer edge portion 106A side of the hinge reinforcement 106 starting from the joint portion 102, and therefore the joint portion 102 is peeled off. Stress (F1) in the direction acts. As described above, when the stress (F1) in the direction of peeling from the door inner panel 108 acts on the hinge reinforcement 106, the deformation of the hinge mounting portion 100 may be further increased.

  On the other hand, in this embodiment, as shown in FIG. 2, the door inner panel 20 and the hinge reinforcement 24 are provided on the offset surfaces 20D and 24B having an angle in the vehicle front-rear direction with respect to the hinge mounting seat surfaces 20C1 and 24A1. A joining portion 34 for joining the two is provided.

  As a result, when viewed along the vehicle vertical direction, the offset surfaces 20D and 24B are arranged so as to intersect with the load (F) input when the back door 16 is closed. A shearing force (F2) acts on the joint 34. That is, the load (F) acting on the joint 34 can be dispersed from the stress (F1 shown in FIG. 6) acting in the peeling direction to the stress (F2) acting in the shear direction.

  Therefore, compared with the case where the stress (F1 shown in FIG. 6) acts in the peeling direction at the joint 34, the joint strength at the joint 34 between the door inner panel 20 and the hinge reinforcement 24 is improved. Can do. Thereby, the peeling of the hinge reinforcement 24 from the door inner panel 20 can be suppressed, and as a result, the deformation of the hinge mounting portion 32 can be suppressed.

  By the way, considering the bonding strength at the bonding portion 34, it is better to provide the bonding portion 34 at a position as close as possible to the outer edge portion 24F of the hinge reinforcement 24. However, since it is difficult to secure the hit point allowance L on the upper side of the hinge mounting seat portions 20C and 24A, it is difficult to provide the joint portion 34 on the upper side of the hinge mounting seat portions 20C and 24A.

  For this reason, in this embodiment, the junction part 34 which joins the door inner panel 20 and the hinge reinforcement 24 to offset surface 20D, 24B which has an angle in the vehicle front-back direction back with respect to hinge mounting seat surface 20C1, 24A1 is provided. ing. Thereby, for example, compared with the case where the joint portion 110 is provided in a state of being flush with the hinge mounting seat surfaces 20C1 and 24A1, the joint portion 34 is offset by an angle offset with respect to the hinge mounting seat surfaces 20C1 and 24A1. Can be shifted upward.

  As a result, in the present embodiment, as shown in FIG. 4, the position of the joint portion 34 is above the extension line Q along the vehicle front-rear direction passing through the position where the bolt 40 is fastened at the hinge mounting portion 32. It can be provided. That is, without changing the position of the outer edge 24F (see FIG. 2) of the hinge reinforcement 24 with respect to the door inner panel 20 (without changing the size of the hinge reinforcement 24), the position of the joint 34 is shifted upward. be able to.

  Moreover, according to this embodiment, the peeling of the hinge reinforcement 24 from the door inner panel 20 when the back door 16 is closed can be further suppressed. That is, the rigidity of the hinge mounting portion 32 can be improved by providing the joint portion 34 on the upper side in the vehicle vertical direction of the hinge mounting portion 32 where moment load concentrates when the back door 16 is closed. Thereby, a deformation | transformation of the hinge attaching part 32 can be suppressed. As a result, the plate thickness of the hinge reinforcement 24 can be reduced, so that the weight can be reduced and the cost can be reduced.

  Further, in the present embodiment, as shown in FIG. 2, the offset surfaces 20D and 24B are formed in the concave portions 25 that are recessed toward the rear side, so that the offset surface is on the front side, although not shown. The space in the vehicle can be widened as compared with the case where it is formed on a convex portion (not shown) projecting toward the front. Moreover, when attaching the hinge member 18 to the hinge attachment part 32, the recessed part 25 does not interfere, and attachment workability | operativity is good.

  Further, in the present embodiment, the cross-sectional shape cut along the vehicle vertical direction including the offset surfaces 20D and 24B has a V shape having a top portion 36 on the rear side in the vehicle front-rear direction. Is provided on the vehicle vertical direction lower side than the extension line Q along the vehicle width direction passing through the position where the bolt 40 is fastened. Thereby, although not shown, since the load is received on the surface as compared with the case where the top portion 36 is provided on the extension line Q, the concave portion when the load (F) is input to the hinge mounting portion 32. The deformation at 25 can be suppressed.

  Further, the back door 16 is closed by providing the joint 34 on the upper side and the top 36 on the lower side across the extension line Q along the vehicle width direction passing through the position where the bolt 40 is fastened. When a load is input to the hinge mounting portion 32 during the process, the folding portion other than the top portion 36 is formed to prevent the hinge reinforcement 24 from being peeled off from the door inner panel 20.

(Other embodiments)
In the present embodiment, as shown in FIG. 2, in the door inner panel 20 and the hinge reinforcement 24, the hinge mounting seats 20 </ b> C and 24 </ b> A are disposed around the hinge mounting seats 20 </ b> A and outward in the vehicle width direction toward the rear side in the vehicle front-rear direction. A recess 25 is provided. The recess 25 is provided with offset surfaces 20D and 24B each having an angle rearward in the vehicle longitudinal direction with respect to the hinge mounting seat surfaces 20C1 and 24A1. However, the offset surfaces 20D and 24B only need to have an angle in the vehicle front-rear direction with respect to the hinge mounting seat surfaces 20C1 and 24A1, and the present invention is not limited to this. For example, although not shown, an offset surface may be formed on a convex portion projecting forward in the vehicle front-rear direction with respect to the hinge mounting seat surfaces 20C1 and 24A1.

  Further, in the present embodiment, the cross-sectional shape cut along the vehicle vertical direction including the offset surfaces 20D and 24B forms a V shape having the apex 36 on the rear side in the vehicle front-rear direction. The shape is not particularly limited to the V shape. For this reason, depending on the shape, a plurality of top portions 36 may be provided, and the positions thereof can be changed as appropriate.

  Moreover, although this embodiment demonstrated the example which joined the hinge reinforcement 24 to the door inner panel 20 by spot welding, in joining the hinge reinforcement 24 to the door inner panel 20, it is not necessarily restricted to spot welding. . For example, joining by laser welding or the like may be used. Moreover, the junction part 34 may be provided in wall part 20E, 24C. Furthermore, in the present embodiment, the bolt is described as an example of the fastener, but the present invention is not limited to the bolt and may be a rivet or the like.

  As mentioned above, although one embodiment of the present invention was described, the present invention is not limited to such an embodiment, and one embodiment and various modifications may be used in combination as appropriate, and the gist of the present invention will be described. Of course, various embodiments can be implemented without departing from the scope.

10 Back door mounting structure 12 Vehicle (body)
14 Opening portion 16 Back door 18 Hinge member 20 Door inner panel 20A Rear surface 20C Hinge mounting seat (hinge mounting seat surface)
20C1 Hinge mounting seat surface 20D Offset surface 24 Hinge reinforcement 24A Hinge mounting seat (hinge mounting seat surface)
24A1 Hinge mounting seat surface 24B Offset surface 32 Hinge mounting portion 34 Joint portion 36 Top portion 40 Bolt (fastener)
Q extension line

Claims (4)

A door inner panel constituting an inner plate of a back door that opens and closes an opening formed at the rear of the vehicle body;
Hinge reinforcement joined to the rear surface of the door inner panel in the vehicle longitudinal direction,
A hinge mounting seat provided on the door inner panel and the hinge reinforcement, to which a hinge member for opening and closing the back door is mounted;
The door inner panel and the hinge reinforcement around the hinge mounting seat surface and on the outer side in the vehicle width direction of the hinge mounting seat surface are recessed or protruded in the vehicle front-rear direction and are front and rear with respect to the hinge mounting seat surface. An offset surface having an angle in the direction;
Provided on the offset surface, a joint for joining the door inner panel and the hinge reinforcement,
Having a back door mounting structure.   2. The back door mounting structure according to claim 1, wherein the joint portion is disposed on an upper side in a vehicle vertical direction with respect to an extension line along a vehicle width direction of a fastener that fixes the hinge member on the hinge mounting seat surface. .   3. The back door mounting structure according to claim 1, wherein the offset surface is provided in a recess that is recessed rearward in the vehicle front-rear direction with respect to the hinge mounting seat surface.   The cross-sectional shape cut along the vehicle vertical direction in the recess forms a V-shape having a top on the rear side in the vehicle front-rear direction, and the top is along the vehicle width direction of the fastener that fixes the hinge member. The back door mounting structure according to claim 3, wherein the back door mounting structure is displaced in the vehicle vertical direction with respect to the extension line.

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